Petr Cech made a shock return toChelsea training this morning ahead of Wednesday night’s Champions League semi-final second leg against Atlético Madrid.

Goalkeeper Cech dislocated his shoulder in last week’s goalless draw in Madrid, which Chelsea claimed had ended the 31-year-old’s season amid fears he will require surgery.

Cech did not take a full part in training in front of the television cameras, as he worked on his own and avoided lifting his arms above his head, which means deputy Mark Schwarzer still appears likely to keep his place at Stamford Bridge.

But Cech’s presence suggested manager Jose Mourinho may be considering risking his fitness, or at least trying to give the player the best possible chance of appearing in the final should Chelsea qualify.

As expected, captain John Terry trained after working hard to recover from the ankle injury he suffered in Madrid and he should return to the centre of Chelsea’s defence.

Eden Hazardand striker Samuel Eto’o also trained and both players are expected to be fit to start against Atlético. Mourinho will be without suspended midfield duo Frank Lampard and John Obi Mikel.

Chelsea target Diego Costa will spearhead Atlético’s attack at Stamford Bridge after failing to score against the Blues in Madrid.

Costa waved to Chelsea fans singing "see you next year" last week, but the striker claims he did not understand what they were saying.

“I didn’t understand anything,” said Costa. “I heard my name and asked what they said. I wasn’t paying much attention.

“I’m not nervous about playing at Chelsea. Something very nice is coming. This match will be different. They have to come on a little stronger. We will come out in the best possible way because we have the incentive.”

Asked whether he is prioritising La Liga, which Atletico top, or the Champions League, Costa added: “The most important thing is winning this match against Chelsea. In La Liga, it’s ours to lose.”